KR101567734B1 - Display device and electronic equipment - Google Patents

Display device and electronic equipment Download PDF

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Publication number
KR101567734B1
KR101567734B1 KR1020140169532A KR20140169532A KR101567734B1 KR 101567734 B1 KR101567734 B1 KR 101567734B1 KR 1020140169532 A KR1020140169532 A KR 1020140169532A KR 20140169532 A KR20140169532 A KR 20140169532A KR 101567734 B1 KR101567734 B1 KR 101567734B1
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South Korea
Prior art keywords
electrode
pixel
driving transistor
potential
pixel array
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KR1020140169532A
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Korean (ko)
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KR20150008021A (en
Inventor
유키히토 이이다
테츠오 미나미
타카오 타니카메
카츠히데 우치노
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소니 주식회사
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Priority to JPJP-P-2007-211623 priority Critical
Priority to JP2007211623A priority patent/JP5251034B2/en
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Publication of KR20150008021A publication Critical patent/KR20150008021A/en
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    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3266Details of drivers for scan electrodes
    • GPHYSICS
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    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0819Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
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    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0842Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
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    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
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    • G09G2300/0842Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G09G2300/0866Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes by means of changes in the pixel supply voltage
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    • G09G2320/043Preventing or counteracting the effects of ageing
    • G09G2320/045Compensation of drifts in the characteristics of light emitting or modulating elements

Abstract

A pixel array unit; Power supply line; And a display device in which each of the pixels has a storage capacitor and one electrode of the storage capacitor is connected to the source electrode of the driving transistor and the other electrode is connected to the auxiliary electrode for each pixel .

Description

[0001] DISPLAY DEVICE AND ELECTRONIC EQUIPMENT [0002]

Priority information

The present invention claims priority from Japanese Patent Application No. 2007-211623, filed on August 15, 2007, to the Japanese Patent Office.

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device and an electronic device, and more particularly to a flat-type (flat panel type) display device in which pixels including electro-optical elements are arranged in a matrix and electronic devices having the display device.

In recent years, in the field of display devices for performing image display, a flat display device in which pixels (pixel circuits) including electro-optical elements are arranged in a matrix is rapidly spreading. As a flat type display device, a current-driven type electro-optical element whose light emission luminance changes according to a current value flowing in a device, for example, an organic EL (electroluminescence) device using an organic EL A display device has been developed and commercialization is proceeding.

The organic EL display device has the following advantages. In other words, since the organic EL element can be driven with an applied voltage of 10 V or less, it is low in power consumption, and since it is a self-luminous element, the light intensity from the light source (backlight) in the liquid crystal cell is controlled for each pixel including the liquid crystal cell In addition, since the liquid crystal display device does not require an illuminating member such as a backlight, which is essential for a liquid crystal display device, it is easy to reduce the weight and thickness of the liquid crystal display device. In addition, since the response speed of the organic EL element is extremely high, about several microseconds, no afterimage occurs in moving picture display.

In the organic EL display device, a simple (passive) matrix method and an active matrix method can be adopted as the driving method in the same manner as the liquid crystal display device. However, the simple matrix type display device has a simple structure. However, since the light emission period of the electro-optical element is reduced by the increase of the scanning lines (that is, the number of pixels), it is difficult to realize a large- have.

Therefore, in recent years, an active element, for example, an insulating gate type field effect transistor (generally, a TFT (Thin Film Transistor)) provided in a pixel circuit such as the electro- A display device of an active matrix type which is controlled by an active matrix type display device is actively developed. In the active matrix type display device, since the electro-optical element continues to emit light over a period of one frame, it is easy to realize a large and high-precision display device.

In general, it is known that the I-V characteristic (current-voltage characteristic) of an organic EL element is deteriorated (so-called deterioration with time) over time. In a pixel circuit using an N-channel TFT as a transistor for driving an organic EL element (hereinafter referred to as "driving transistor"), an organic EL element is connected to the source side of the driving transistor. When the IV characteristic deteriorates with the passage of time, the gate-source voltage (Vgs) of the driving transistor changes, and as a result, the light emission luminance of the organic EL element also changes.

This will be described in more detail. The source potential of the driving transistor is determined by the operating point of the driving transistor and the organic EL element. When the I-V characteristic of the organic EL element deteriorates, the operating point of the driving transistor and the organic EL element fluctuates. Therefore, even if the same voltage is applied to the gate of the driving transistor, the source potential of the driving transistor changes. As a result, the source-gate voltage Vgs of the drive transistor changes, so that the current value flowing in the drive transistor changes. As a result, the current value flowing through the organic EL element also changes, so that the light emission luminance of the organic EL element changes.

In addition, in the pixel circuit using the polysilicon TFT, in addition to the deterioration with time of the IV characteristic of the organic EL element, the threshold voltage (Vth) of the driving transistor and the mobility of the semiconductor thin film constituting the channel of the driving transistor The threshold voltage Vth and the mobility μ are different for each pixel due to a variation in the manufacturing process over time or variations in the transistor characteristics have).

If the threshold voltage (Vth) and the mobility (μ) of the driving transistor are different from one pixel to another, deviation occurs in the current value flowing to the driving transistor for each pixel. Therefore, even if the same voltage is applied between the pixels to the gate of the driving transistor, The brightness of the light emitted from the pixels varies between the pixels, and as a result, uniformity (uniformity) of the screen is impaired.

Thus, even if the IV characteristic of the organic EL element deteriorates with the passage of time, or the threshold voltage (Vth) or the mobility (μ) of the driving transistor changes over time, the light emission luminance of the organic EL element is maintained constant (Hereinafter referred to as "threshold correction") or the mobility of the driving transistor (hereinafter referred to as " threshold correction "), (hereinafter referred to as "mobility correction") is provided for each of the pixel circuits (see, for example, Japanese Patent Laid-Open Publication No. 2006-133542 , Patent Document 1)).

In the prior art described in Patent Document 1, each of the pixels has a function of compensating for variations in the characteristics of the organic EL element and a function of correcting variations in threshold voltage (Vth) and mobility (μ) of the driving transistor, Even if the IV characteristic of the EL element deteriorates with the passage of time or the threshold voltage (Vth) or the mobility (μ) of the driving transistor changes over time, the light emission luminance of the organic EL element can be kept constant On the other hand, on the other hand, the number of elements constituting the pixel is increased, which results in miniaturization of the pixel size and further obstruction of high definition of the display device.

The recording gain at the time of recording a video signal in a pixel is determined by the capacity value of the storage capacitor for storing the recorded video signal and the capacity value of the capacity component of the organic EL element (the details will be described later) As miniaturization of the pixel size progresses with high definition of the display device, the size of the electrode forming the organic EL element becomes small, and the capacitance value of the capacitance component of the organic EL element becomes small accordingly, . If the recording gain is lowered, the signal potential corresponding to the video signal can not be stored in the storage capacity, so that the light emission luminance corresponding to the signal level of the video signal can not be obtained.

Therefore, it is an object of the present invention to provide a display device which can constitute a pixel with fewer components and can sufficiently secure a recording gain of a video signal, and an electronic apparatus using the display device.

In order to achieve the above object, a display device according to an embodiment of the present invention is defined to include a pixel array portion, a power supply line, and an auxiliary electrode. The pixel array section includes pixels arranged in a matrix form. Each pixel includes an electro-optical element, a recording transistor for recording a video signal, and a storage capacitor for storing the video signal recorded by the recording transistor. Each pixel further includes a driving transistor for driving the electro-optical element based on the video signal stored in the storage capacitor.

The power supply unit is provided for each of the pixel rows of the pixel array unit so as to be wired close to the scanning line belonging to the adjacent pixel row and to selectively apply the first potential and the second potential lower than the first potential to the drain electrode of the driving transistor . The auxiliary electrodes are wired in a row, a column, or a lattice shape with respect to the pixel array of the matrix array of the pixel array portion, and are given fixed potentials. The pixel has a storage capacitor. One of the electrodes of the auxiliary capacitance is connected to the source electrode of the driving transistor and the other electrode is connected to the auxiliary electrode for each pixel.

In the display device having the above configuration and the electronic apparatus having the display device, the drive transistor that receives the current from the power supply line by selectively supplying the first potential and the second potential to the drain electrode of the drive transistor through the power supply line , The electro-optical element is driven to emit light when the first electric potential is supplied, and the electro-optical element is set to be non-light-emitting when the second electric potential is supplied. Thus, the driving transistor has a function of controlling light emission / non-light emission in addition to the function of current driving the electro-optical element. Therefore, a dedicated transistor for controlling light emission / non-light emission is not required.

Since the storage capacity of the video signal is determined by the capacitance value of the electro-optical element, the storage capacity, and the storage capacity, by providing the storage capacitor having one end connected to the source electrode of the drive transistor in addition to the storage capacitor, The recording gain of the video signal can be increased by the capacity value of the capacity. Here, in order to form the auxiliary capacitance by connecting the other electrode of the auxiliary capacitance for each pixel to the auxiliary electrode wired in a row, column, or lattice shape with respect to the pixel array in a matrix form and given a fixed potential , It is possible to give a fixed potential to the other electrode of the storage capacitor without providing the cathode wiring in the TFT layer and to form the storage capacitor with respect to the fixed potential.

According to the present invention, by providing the driving transistor with a function of controlling the light emission / non-light emission in addition to the function of current-driving the electro-optical element, pixels can be constituted by fewer elements than the two transistors of the recording transistor and the driving transistor have. Further, by having a storage capacity in addition to the storage capacity, the recording gain of the video signal can be sufficiently secured.

Then, the other electrode of the storage capacitor is connected for each pixel to the auxiliary electrode wired in a row, column, or lattice shape with respect to the pixel array in a matrix form and given a fixed potential, thereby forming a cathode wiring in the TFT layer The fixed potential can be given to the other electrode. Thereby, since the auxiliary capacitance can be formed with respect to the fixed potential while suppressing the wiring resistance, it is possible to suppress crosstalk caused by the wiring resistance, thereby improving the picture quality of the display image.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a system configuration diagram showing an outline of the configuration of an active matrix type organic EL display device which is a premise of the present invention. Fig.
2 is a circuit diagram showing a specific configuration example of a pixel (pixel circuit);
Fig. 3 is a timing waveform chart provided in an operation description of an active matrix type organic EL display device as a premise of the present invention. Fig.
4A to 4D are explanatory views (1) of circuit operation of an active matrix type organic EL display device which is a premise of the present invention.
5A to 5D are explanatory diagrams (part 2) of the circuit operation of the active matrix type organic EL display device which is a premise of the present invention.
6A to 6C are explanatory diagrams (part 3) of the circuit operation of the active matrix type organic EL display device which is a premise of the present invention.
Fig. 7 is a characteristic diagram provided to explain the problem caused by the deviation of the threshold voltage Vth of the driving transistor. Fig.
Fig. 8 is a characteristic diagram provided for explaining a problem caused by a deviation of the mobility (mu) of the driving transistor. Fig.
9A to 9C are characteristic diagrams for explaining the relationship between the signal voltage (Vsig) of the video signal and the drain-source current (Ids) of the driving transistor due to the presence or absence of the threshold correction and mobility correction.
10 is a circuit diagram showing a pixel structure having an auxiliary capacitance;
11 is an equivalent circuit diagram showing the wiring resistance R due to pulling-off of the cathode wiring in the TFT layer.
12 is a timing waveform diagram showing a state in which the cathode potential fluctuates due to the wiring resistance R. Fig.
13 is a diagram showing the cross-talk occurring due to the wiring resistance R. Fig.
14 is a plan view showing a layout example of an auxiliary electrode with respect to a matrix-shaped pixel array.
15 is a plan view schematically showing a layout structure of pixels having an auxiliary capacitance.
16 is a cross-sectional view showing a cross-sectional structure of a pixel according to Embodiment 1. Fig.
17 is a cross-sectional view showing a cross-sectional structure of a pixel according to Embodiment 2. Fig.
18 is a cross-sectional view showing a cross-sectional structure of a pixel according to Embodiment 3;
19 is a perspective view showing the appearance of a television set to which the present invention is applied;
20A and 20B are perspective views showing the external appearance of a digital camera to which the present invention is applied, wherein A is a perspective view seen from the front side, and B is a perspective view seen from a rear side.
FIG. 21 is a perspective view showing the appearance of a notebook personal computer to which the present invention is applied; FIG.
22 is a perspective view showing the appearance of a video camera to which the present invention is applied;
23A to 23G are external views showing a mobile phone to which the present invention is applied, A is a front view in a soft state, B is a side view, C is a front view in a closed state, D is a left side view, F is a top view, and G is a bottom view.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Display device serving as a premise of the present invention]

Fig. 1 is a system configuration diagram showing an outline of the configuration of an active matrix display device as a premise of the present invention.

Here, as an example, an active matrix type electro-optical element, for example, an organic EL element (organic electroluminescent element) in which the light emission luminance varies in response to a current flowing in a device is used as a light emitting element of a pixel Type organic EL display device will be described as an example.

1, the organic EL display device 10 includes a pixel array unit 30 in which pixels (PXLC) 20 are two-dimensionally arranged in a matrix form (matrix shape), and a pixel array unit 30, and has a driving section for driving each of the pixels 20. As the driving unit for driving the pixel 20, for example, a recording scanning circuit 40, a power supply scanning circuit 50 and a horizontal driving circuit 60 are provided.

Scanning lines 31-1 to 31-m and power supply lines 32-1 to 32-m are wired for each pixel row in the pixel array of m rows and n columns in the pixel array unit 30, (33-1 to 33-n) are wired.

The pixel array unit 30 is usually formed on a transparent insulating substrate such as a glass substrate and has a flat panel structure. Each pixel 20 of the pixel array unit 30 can be formed using an amorphous silicon TFT (thin film transistor) or a low-temperature polysilicon TFT. Temperature polycrystalline silicon TFT is used, the display panel (substrate) 70 on which the pixel array portion 30 is formed is also used for the recording scanning circuit 40, the power supply scanning circuit 50 and the horizontal driving circuit 60, As shown in FIG.

The write scanning circuit 40 is constituted by a shift register or the like for sequentially shifting (transmitting) the start pulse sp in synchronism with the clock pulse ck and supplies the video signal Vs to each pixel 20 of the pixel array unit 30. [ (Scanning signals) WS1 to WSm are sequentially supplied to the scanning lines 31-1 to 31-m in accordance with the writing of the pixels 20-1 to 20-m in the row direction in each pixel 20 of the pixel array unit 30 (Line-sequential scanning).

The power supply scanning circuit 50 is constituted by a shift register or the like for sequentially shifting the start pulse sp in synchronization with the clock pulse ck and is supplied with the potentials of different potentials in synchronization with the line- The power supply line potentials DS1 to DSm which are switched to the first potential Vccp and the second potential Vini lower than the first potential Vccp are selectively supplied to the power supply lines 32-1 to 32- The light emission / non-light emission of the pixel 20 is controlled.

The horizontal drive circuit 60 generates a signal voltage Vsig of a video signal corresponding to luminance information supplied from a signal source (not shown) (hereinafter sometimes simply referred to as a "signal voltage") and an offset voltage Vofs, And records the pixels 20 of the pixel array unit 30 in units of rows, for example, through the signal lines 33-1 to 33-n. That is, the horizontal drive circuit 60 adopts a drive mode of line-sequential recording in which the signal voltage Vsig of the video signal is recorded in a row (line) unit.

Here, the offset voltage Vofs is a reference voltage (for example, a voltage corresponding to a black level) serving as a reference of the signal voltage Vsig of the video signal. The second potential Vini is a potential lower than the offset voltage Vofs, for example, a potential lower than Vofs-Vth when the threshold voltage of the driving transistor 22 is Vth, preferably Vofs-Vth Is set to a sufficiently low potential.

(Pixel circuit)

2 is a circuit diagram showing a concrete configuration example of the pixel (pixel circuit) 20. As shown in Fig.

2, the pixel 20 has a current drive type electro-optical element, for example, an organic EL element 21 as a light emitting element, the light emission luminance of which changes in response to a current flowing in the device, A pixel structure having the driving transistor 22, the writing transistor 23 and the storage capacitor 24, that is, 2Tr / 1C (which is composed of two transistors Tr and one capacitor C), in addition to the EL element 21, As shown in Fig.

In the pixel 20 having such a configuration, an N-channel TFT is used as the driving transistor 22 and the recording transistor 23. [ However, the combinations of the conductivity types of the drive transistor 22 and the write transistor 23 are merely examples, and the combination thereof is not limited thereto.

In the organic EL element 21, a cathode electrode is connected to a common power supply line 34 commonly wired to all the pixels 20. [ The source electrode of the driving transistor 22 is connected to the anode electrode of the organic EL element 21 and the drain electrode thereof is connected to the power supply line 32 (one of the power supply lines 32-1 to 32-m).

The write transistor 23 has a gate electrode connected to the scanning line 31 (one of 31-1 to 31-m) and one electrode (source electrode / drain electrode) connected to the signal line 33 -n), and the other electrode (drain electrode / source electrode) is connected to the gate electrode of the driving transistor 22. The other electrode

The storage capacitor 24 has one electrode connected to the gate electrode of the driving transistor 22 and the other electrode connected to the source electrode of the driving transistor 22 have.

In the pixel 20 having the pixel configuration of 2Tr / 1C, the writing transistor 23 is rendered conductive in response to the scanning signal WS applied from the writing scanning circuit 40 through the scanning line 31 to the gate electrode The signal voltage Vsig or the offset voltage Vofs of the video signal corresponding to the luminance information supplied from the horizontal drive circuit 60 through the signal line 33 is sampled and recorded in the pixel 20. [

The written signal voltage Vsig or the offset voltage Vofs is applied to the gate electrode of the driving transistor 22 and is stored in the storage capacitor 24. The driving transistor 22 is supplied with a current from the power supply line 32 when the potential DS of the power supply line 32 (one of the power supply lines 32-1 to 32-m) is at the first potential Vccp The drive current of the current value corresponding to the voltage value of the signal voltage Vsig stored in the storage capacitor 24 is supplied to the organic EL element 21 and the organic EL element 21 is driven to current to cause the light emission.

(Circuit operation of the organic EL display device)

Next, the circuit operation of the organic EL display device 10 having the above-described structure will be described with reference to the operation explanatory diagrams of Figs. 4 to 6, based on the timing waveform diagram of Fig. 4 to 6, in order to simplify the drawing, the write transistor 23 is shown as a symbol of a switch. Since the organic EL element 21 has a capacitance component, the EL capacitance 25 is also shown.

In the timing waveform diagram of Fig. 3, the change of the potential (write pulse) WS of the scanning line 31 (one of 31-1 to 31-m), the change of the potential of the power supply lines 32 (Vccp / Vini) of the driving transistor 22, the gate potential Vg and the source potential Vs of the driving transistor 22, respectively.

≪ Light emission period &

In the timing chart of Fig. 3, before the time t1, the organic EL element 21 is in a light emitting state (light emitting period). In this light emission period, the potential DS of the power supply line 32 is at the first potential Vccp and the recording transistor 23 is in the non-conduction state.

At this time, since the driving transistor 22 is set to operate in the saturation region, as shown in Fig. 4A, the gate of the corresponding driving transistor 22 from the power supply line 32 through the driving transistor 22 (A current between drain and source) Ids corresponding to the source-to-source voltage Vgs is supplied to the organic EL element 21. [ Therefore, the organic EL element 21 emits light with a luminance corresponding to the current value of the driving current Ids.

<Threshold calibration preparation period>

At time t1, the line progressive scan enters a new field, and the potential DS of the power supply line 32 becomes the first potential (hereinafter referred to as "high potential" (Hereinafter referred to as "low potential") Vini sufficiently lower than Vofs-Vth (Vofs: the offset voltage of the signal line 33)

Assuming that the threshold voltage of the organic EL element 21 is Vel and the potential of the common power supply line 34 is Vcath and the low potential Vini is Vini <Vel + Vcath, the source potential of the driving transistor 22 (Vs) becomes substantially equal to the low potential (Vini), the organic EL element 21 becomes reverse biased and extinguished.

Next, at time t2, the potential WS of the scanning line 31 transitions from the low potential side to the high potential side, and the recording transistor 23 becomes conductive as shown in Fig. 4C. At this time, since the offset voltage Vofs is supplied from the horizontal drive circuit 60 to the signal line 33, the gate potential Vg of the drive transistor 22 becomes the offset voltage Vofs. The source potential Vs of the driving transistor 22 is at a potential Vini sufficiently lower than the offset voltage Vofs.

At this time, the gate-source voltage Vgs of the driving transistor 22 becomes Vofs-Vini. Here, if Vofs-Vini is not larger than the threshold voltage Vth of the driving transistor 22, it is impossible to perform a threshold correction operation, which will be described later, and therefore it is necessary to set the potential relationship of Vofs-Vini> Vth. In this manner, the operation of fixing the gate potential Vg of the driving transistor 22 to the offset voltage Vofs and the source potential Vs to the low potential Vini and initializing them is the operation of threshold correction preparation.

&Lt; First threshold value correction period &

4D, when the potential DS of the power supply line 32 is switched from the low potential Vini to the high potential Vccp, the driving transistor 22 is turned on, The source potential Vs of the first threshold value starts to rise and enters the first threshold value correction period. In this first threshold value correction period, the gate-source voltage Vgs of the driving transistor 22 becomes a predetermined potential Vx1 as the source potential Vs of the driving transistor 22 rises, (Vx1) is stored in the storage capacitor (24).

5A, the signal voltage Vsig of the video signal is supplied from the horizontal drive circuit 60 to the signal line 33 at the time t4 when the horizontal period 1H enters the second half of the horizontal period 1H, The potential of the signal line 33 transitions from the offset voltage Vofs to the signal voltage Vsig. In this period, the signal voltage Vsig is written to the pixels of the other row.

At this time, the potential WS of the scanning line 31 is shifted from the high potential side to the low potential side in order to prevent the signal voltage Vsig from being written to the self-driving pixel, Non-conduction state. Thus, the gate electrode of the driving transistor 22 is separated from the signal line 33 and becomes a floating state.

Here, when the gate electrode of the driving transistor 22 is in the floating state, the storage capacitor 24 is connected between the gate and the source of the driving transistor 22, whereby the source potential Vs , The gate potential Vg of the driving transistor 22 fluctuates (interlocks) with the fluctuation of the source potential Vs. This is the bootstrap operation by the storage capacitor 24. [

Even after the time t4, the source potential Vs of the driving transistor 22 continues to rise and increases by Va1 (Vs = Vofs-Vx1 + Va1). At this time, the gate potential Vg also increases by Va1 (Vg = Vofs + Va1) in conjunction with the rise of the source potential Vs of the drive transistor 22 by the bootstrap operation.

&Lt; Second threshold correction period &

The potential WS of the scanning line 31 transitions from the low potential side to the high potential side and the writing transistor 23 is in the conduction state And the offset voltage Vofs is supplied to the signal line 33 instead of the signal voltage Vsig from the horizontal drive circuit 60 to enter the second threshold correction period.

In this second threshold value correction period, since the offset voltage Vofs is recorded as the write transistor 23 is turned on, the gate potential Vg of the drive transistor 22 is reset to the offset voltage Vofs again . At this time, the source potential Vs decreases in conjunction with the lowering of the gate potential Vg. Then, again, the source potential Vs of the driving transistor 22 starts rising.

In this second threshold correction period, the gate-source voltage Vgs of the driving transistor 22 becomes a predetermined potential Vx2 as the source potential Vs of the driving transistor 22 rises, This potential Vx2 is stored in the storage capacitor 24. [

Subsequently, at time t6, which is the second half of this horizontal period, the signal voltage Vsig of the video signal is supplied from the horizontal driving circuit 60 to the signal line 33 as shown in Fig. 5C The potential of the signal line 33 transitions from the offset voltage Vofs to the signal voltage Vsig. In this period, the signal voltage Vsig is written to the pixel of the other row (the row next to the previous recording row).

At this time, the potential WS of the scanning line 31 is shifted from the high potential side to the low potential side in order to prevent the signal voltage Vsig from being written to the self-driving pixel, Non-conduction state. Thus, the gate electrode of the driving transistor 22 is separated from the signal line 33 and becomes a floating state.

Even after the time t6, the source potential Vs of the driving transistor 22 continues to rise and increases by Va2 (Vs = Vofs-Vx1 + Va2). At this time, the gate potential Vg also increases by Va2 (Vg = Vofs + Va2) in conjunction with the rise of the source potential Vs of the drive transistor 22 by the bootstrap operation.

&Lt; Third threshold correction period &

The potential WS of the scanning line 31 transitions from the low potential side to the high potential side as shown in Fig. 5D, and the recording transistor 23 is in the conduction state And the offset voltage Vofs is supplied from the horizontal drive circuit 60 to the signal line 33 instead of the signal voltage Vsig to enter the third threshold correction period.

In this third threshold value correction period, since the offset voltage Vofs is recorded as the write transistor 23 is turned on, the gate potential Vg of the drive transistor 22 is reset to the offset voltage Vofs again . At this time, the source potential Vs decreases in conjunction with the lowering of the gate potential Vg. Then, again, the source potential Vs of the driving transistor 22 starts rising.

The source potential Vs of the driving transistor 22 rises and eventually the gate-source voltage Vgs of the driving transistor 22 converges to the threshold voltage Vth of the driving transistor 22, A voltage corresponding to the threshold voltage Vth is stored in the storage capacitor 24. [

The threshold voltage Vth of the individual drive transistors 22 is detected by the three threshold value correction operations described above and a voltage corresponding to the threshold voltage Vth is stored in the storage capacitor 24. [ The common power supply line 34 is set so that the organic EL element 21 is in the cutoff state in order to prevent the current from flowing only to the storage capacitor 24 side and not to the organic EL element 21 side in the three threshold value correction periods. The potential Vcath of the transistor Q1 is set.

&Lt; Signal writing period & mobility correction period &gt;

Next, at time t8, the potential WS of the scanning line 31 transitions to the low potential side, so that the recording transistor 23 becomes non-conductive as shown in Fig. 6A, and at the same time, 33 are switched from the offset voltage Vofs to the signal voltage Vsig of the video signal.

The gate electrode of the driving transistor 22 becomes a floating state due to the non-conductive state of the writing transistor 23. However, since the gate-source voltage Vgs is equal to the threshold voltage Vth of the driving transistor 22 , The corresponding drive transistor 22 is in a cut-off state. Therefore, the drain-source current Ids does not flow to the driving transistor 22.

Subsequently, at time t9, the potential WS of the scanning line 31 transitions to the high potential side, so that the recording transistor 23 becomes conductive as shown in Fig. 6B, and the signal voltage (Vsig) is sampled and recorded in the pixel 20. The writing of the signal voltage Vsig by the writing transistor 23 causes the gate potential Vg of the driving transistor 22 to become the signal voltage Vsig.

When the driving transistor 22 is driven by the signal voltage Vsig of the video signal, the threshold voltage Vth of the driving transistor 22 corresponds to the threshold voltage Vth stored in the storage capacitor 24 The threshold correction is performed. The principle of threshold correction will be described later.

At this time, since the organic EL element 21 is initially in the cutoff state (high impedance state), the current flowing from the power supply line 32 to the driving transistor 22 (drain-source voltage Vsig) Source current Ids) flows into the EL capacitor 25 of the organic EL element 21, so that charging of the EL capacitor 25 starts.

By the charging of the EL capacitor 25, the source potential Vs of the driving transistor 22 rises with the lapse of time. At this time, the deviation of the threshold voltage Vth of the driving transistor 22 has already been corrected (threshold correction), and the drain-source current Ids of the driving transistor 22 has already reached the mobility of the driving transistor 22 (μ).

The gate-source voltage Vgs of the driving transistor 22 becomes Vsig-Vofs + Vth-? V when the source potential Vs of the driving transistor 22 goes up to the potential of Vofs-Vth +? V. That is to say, the rising edge? V of the source potential Vs is subtracted from the voltage Vsig-Vofs + Vth stored in the storage capacitor 24, in other words, to discharge the charge stored in the storage capacitor 24 And negative feedback is obtained. Therefore, the increase (? V) of the source potential (Vs) becomes the feedback amount of the negative feedback.

As described above, by driving the drain-source current Ids flowing in the driving transistor 22 to the gate input of the driving transistor 22, that is, the gate-source voltage Vgs, Mobility correction for eliminating the dependence on the mobility (μ) of the drain-source current Ids of the pixel (i), that is, for each pixel of the mobility μ is corrected.

More specifically, the higher the signal voltage Vsig of the video signal, the larger the absolute value of the feedback amount (correction amount)? V of the negative feedback because the drain-source current Ids becomes larger. Therefore, mobility correction corresponding to the light emission luminance level is performed. In addition, when the signal voltage Vsig of the video signal is kept constant, the absolute value of the feedback amount DELTA V of the negative feedback also increases as the mobility of the driving transistor 22 increases. Therefore, mu) can be eliminated. The principle of mobility correction will be described later.

&Lt; Light emission period &

Next, at time t10, the potential WS of the scanning line 31 transitions to the low potential side, so that the recording transistor 23 becomes non-conductive as shown in Fig. 6C. Thus, the gate electrode of the driving transistor 22 is separated from the signal line 33 and becomes a floating state.

The gate electrode of the driving transistor 22 becomes a floating state and at the same time the current Ids between the drain and the source of the driving transistor 22 begins to flow into the organic EL element 21, ) Rises in response to the drain-source current Ids of the driving transistor 22.

The rise of the anode potential of the organic EL element 21 is equal to the rise of the source potential Vs of the driving transistor 22. When the source potential Vs of the driving transistor 22 rises, the gate potential Vg of the driving transistor 22 also increases in conjunction with the bootstrap operation of the storage capacitor 24.

At this time, when the bootstrap gain is assumed to be 1 (ideal value), the amount of rise of the gate potential Vg becomes equal to the amount of rise of the source potential Vs. Thus, the gate-source voltage Vgs of the driving transistor 22 during the light emission period is kept constant at Vsig-Vofs + Vth-? V. At time t11, the potential of the signal line 33 is switched from the signal voltage Vsig of the video signal to the offset voltage Vofs.

As is apparent from the above description of the operation, in this example, the threshold correction period is provided for a total of 3H periods of a 1H period during which signal recording and mobility correction is performed and a 2H period preceding the 1H period. Thereby, a sufficient time can be secured as the threshold correction period, so that the threshold voltage Vth of the drive transistor 22 can be reliably detected and stored in the storage capacitor 24, and the threshold correction operation can be reliably performed.

The threshold correction period is provided over the 3H period. However, this is merely an example. If it is possible to secure a sufficient time as the threshold correction period in the 1H period in which the signal recording and the mobility correction are performed, It is not necessary to set the threshold value correction period over the threshold value and if the 1H period is shortened with high precision and a sufficient time can not be secured even if the threshold correction period is provided over the 3H period, It is also possible to set the period.

(Principle of threshold correction)

Here, the principle of threshold correction of the driving transistor 22 will be described. Since the driving transistor 22 is designed to operate in the saturation region, it operates as a constant current source. Thus, a constant drain-source current (drive current) Ids given by the following equation (1) is supplied from the drive transistor 22 to the organic EL element 21.

Ids = (1/2) 占 (W / L) Cox (Vgs-Vth) 2 ... ... (One)

Here, W is the channel width of the driving transistor 22, L is the channel length, and Cox is the gate capacitance per unit area.

Fig. 7 shows the characteristics of the drain-source current Ids and the gate-source voltage Vgs of the driving transistor 22.

Source voltage Vgs when the threshold voltage Vth is Vth1 unless the deviation of the threshold voltage Vth of the driving transistor 22 is corrected for each pixel as shown in this characteristic diagram. The drain-source current Ids corresponding to the drain-source current Ids1 becomes Ids1.

In contrast, when the threshold voltage Vth is Vth2 (Vth2> Vth1), the drain-source current Ids corresponding to the same gate-source voltage Vgs becomes Ids2 (Ids2 <Ids). That is, if the threshold voltage Vth of the driving transistor 22 fluctuates, the drain-source current Ids fluctuates even if the gate-source voltage Vgs is constant.

On the other hand, in the pixel (pixel circuit) 20 having the above structure, as described above, since the gate-source voltage Vgs of the driving transistor 22 at the time of light emission is Vsig-Vofs + Vth-? V, Substituting into the equation (1), the drain-source current Ids becomes

Ids = (1/2) 占 (W / L) Cox (Vsig-Vofs-? V) 2 ... ... (2)

.

That is, the term of the threshold voltage Vth of the driving transistor 22 is canceled, and the drain-source current Ids supplied from the driving transistor 22 to the organic EL element 21 is And does not depend on the threshold voltage Vth. As a result, even if the threshold voltage Vth of the driving transistor 22 fluctuates from pixel to pixel due to variation or aging of the manufacturing process of the driving transistor 22, the drain-source current Ids does not fluctuate , The emission luminance of the organic EL element 21 can be kept constant.

(Principle of mobility correction)

Next, the principle of the mobility correction of the driving transistor 22 will be described. 8 shows a state in which the pixel A having a relatively large mobility μ of the driving transistor 22 and the pixel B having a relatively small mobility μ of the driving transistor 22 are compared, FIG. When the driving transistor 22 is formed of a polysilicon thin film transistor or the like, it is unavoidable that the mobility μ is disturbed between the pixels, such as the pixel A and the pixel B.

In the case where the signal voltage Vsig of the video signal of the same level is recorded in both of the pixels A and B while the mobility μ of the pixel A and the pixel B varies, Source current Ids1 'flowing in the pixel A having a large mobility μ and the drain-source current Ids1' flowing in the pixel B having a small mobility μ can be obtained without correcting the mobility μ. A large difference is generated between the currents Ids1 'and Ids2'. As described above, if there is a large difference between the pixels in the drain-source current Ids due to the deviation of the mobility μ from pixel to pixel, the uniformity of the screen is impaired.

Here, as apparent from the transistor characteristic equation of the above-mentioned equation (1), when the mobility μ is large, the drain-source current Ids becomes large. Therefore, the feedback amount? V in the negative feedback increases as the mobility? Increases. As shown in Fig. 8, the feedback amount DELTA V1 of the pixel A having a large mobility is larger than the feedback amount DELTA V2 of the pixel B having a small mobility.

Thus, by making the drain-source current Ids of the driving transistor 22 return to the signal voltage Vsig side of the video signal by the mobility correction operation, the larger the mobility μ, the larger the negative feedback is , It is possible to suppress the deviation of the mobility (μ) for each pixel.

Specifically, when correction of the feedback amount? V1 is made in the pixel A having a large mobility μ, the drain-source current Ids drops greatly from Ids1 'to Ids1. On the other hand, since the feedback amount DELTA V2 of the pixel B having a small mobility is small, the drain-source current Ids falls from Ids2 'to Ids2 and does not fall so much. As a result, the current Ids1 between the drain and the source of the pixel A and the current Ids2 between the drain and the source of the pixel B become substantially equal, and thus the deviation of the mobility μ from pixel to pixel is corrected .

In summary, when there is a pixel A and a pixel B having different mobility, the feedback amount DELTA V1 of the pixel A having a large mobility μ has a mobility μ Becomes larger than the feedback amount DELTA V2 of the small pixel B. That is, the larger the mobility μ, the larger the feedback amount ΔV and the larger the amount of decrease in the drain-source current Ids.

Source current Ids of the driving transistor 22 to the signal voltage Vsig side of the video signal so that the mobility μ of the drain-source current Ids of the other pixel . As a result, the deviation of the mobility (μ) for each pixel can be corrected.

Here, in the pixel (pixel circuit) 20 shown in Fig. 2, the signal potential (sampling potential) Vsig of the video signal due to the presence or absence of the threshold correction, mobility correction, And the current Ids will be described with reference to FIG.

In Fig. 9, A shows a case where threshold correction and mobility correction are not performed together, B shows a case in which mobility correction is not performed, only a threshold correction is performed, and C shows a case in which threshold correction and mobility correction are performed together . As shown in Fig. 9A, when threshold correction and mobility correction are not performed at the same time, due to a deviation of the threshold voltage (Vth) and the mobility (μ) for each of the pixels (A, B) A large difference between the currents Ids and the pixels A and B is generated.

On the other hand, in the case where only the threshold correction is performed, the deviation of the drain-source current Ids can be reduced to some extent by the threshold correction as shown in Fig. 9B, The difference between the drain-source current Ids between the pixels A and B due to the deviation for each of the pixels A and B remains.

By performing the threshold correction and the mobility correction at the same time, as shown in FIG. 9C, the pixel (A) and the pixel (B) due to the deviation of the threshold voltage (Vth) The difference between the drain-source currents Ids between the organic EL element 21 and the organic EL element 21 can be substantially eliminated, so that the luminance deviation of the organic EL element 21 does not occur in any gradation, and a display image of good image quality can be obtained .

The pixel 20 shown in Fig. 2 has the above-described bootstrap function in addition to each of the correction functions of the threshold correction and the mobility correction, so that the following operations and effects can be obtained.

That is, even if the IV characteristic of the organic EL element 21 changes over time and the source potential Vs of the driving transistor 22 changes accordingly, the bootstrap operation by the storage capacitor 24 causes the driving Since the gate-source potential Vgs of the transistor 22 is kept constant, the current flowing through the organic EL element 21 does not change. Therefore, since the luminescence brightness of the organic EL element 21 is also kept constant, image display without luminance deterioration accompanying the change of the I-V characteristic with the lapse of time can be realized.

[Problems due to the drop in capacitance value of the capacitance component of the organic EL element]

As described above, in the organic EL display device 10 having the correction functions of the threshold correction and the mobility correction, when the pixel size is miniaturized with high definition, the electrode size (the size of the organic EL element 21) And accordingly, the capacitance value of the capacitance component of the organic EL element 21 becomes smaller. Then, the recording gain of the signal voltage (Vsig) of the video signal is lowered by the amount corresponding to the decrease in the capacitance value of the capacitance component of the organic EL element (21).

Assuming here that the capacitance value of the EL capacitance 25 is Cel and the capacitance value of the storage capacitor 24 is Cs, the voltage Vgs actually stored in the storage capacitor 24 when the signal voltage Vsig of the video signal is recorded is ,

Vgs = Vsig x {1-Cs / (Cs + Cel)} ... ... (3)

.

Therefore, the ratio of the storage voltage Vgs of the storage capacitor 24 to the signal voltage Vsig, that is, the write gain G (= Vgs / Vsig)

G = 1-Cs / (Cs + Cel) ... ... (4)

. As can be seen from this formula (4), when the capacitance value Cel of the capacitance component of the organic EL element 21 is lowered, it can be seen that the recording gain G is lowered to that extent.

In order to compensate for the decrease in the write gain G, a storage capacitor may be added to the source electrode of the drive transistor 22. Assuming that the capacity value of the auxiliary capacity is Csub, the recording gain (G)

G = 1-Cs / (Cs + Cel + Csub) ... ... (5)

.

As is apparent from this formula (5), the larger the capacity value Csub of the storage capacitor to be added is, the closer the recording gain G is to 1, and the closer to the signal voltage Vsig of the video signal to be written in the pixel 20 The light emission luminance corresponding to the signal voltage Vsig of the video signal to be written in the pixel 20 can be obtained because the voltage Vgs can be stored in the storage capacitor 24. [

As is apparent from the above, the recording gain G of the signal voltage Vsig of the video signal can be adjusted by adjusting the capacity value Csub of the storage capacitor. The size of the driving transistor 22 differs depending on the color of light emitted from the organic EL element 21. [ Therefore, white balance can be obtained by adjusting the capacity value Csub of the storage capacitor in accordance with the emission color of the organic EL element 21, that is, the size of the driving transistor 22.

Further, letting Ids be the current between the drain and the source of the driving transistor 22 and DELTA V be the voltage value corrected by the mobility correction, the mobility correction period t for performing the mobility correction described above,

t = (Cel + Csub) x DELTA V / Ids ... ... (6)

. As is apparent from this formula (6), the mobility correction period t can be adjusted by the capacity value Csub of the storage capacitor.

[Pixel structure with storage capacity]

10 is a circuit diagram showing a pixel structure having an auxiliary capacitance. In the figure, the same parts as those in FIG. 2 are denoted by the same reference numerals.

10, the pixel 20 has an organic EL element 21 as a light emitting element and includes, in addition to the organic EL element 21, a driving transistor 22, a recording transistor 23, (26) in which one electrode is connected to the source electrode of the driving transistor (22) and the other electrode is connected to the common power supply line (34), which is a fixed potential, in the pixel structure having the pixel electrode (24) .

Here, when the cathode wiring is provided in the TFT layer (corresponding to the TFT layer 207 in Figs. 16 to 18) in forming the storage capacitor 26, Problems such as transverse crosstalk occur. The reason why the crossing occurs due to the wiring resistance is as follows.

11, a wiring resistance R is interposed between the cathode electrode of the organic EL element 21 and the common power supply line 34. In this case, Then, as shown in Fig. 12, the cathode potential of the organic EL element 21 fluctuates in synchronization with the potential variation of the signal line 33. Fig. When the shaking of the cathode potential shows, for example, a black window, as shown in Fig. 13, the cathode window appears as bright crosstalk (transverse crosstalk) in the horizontal direction of the black window on the display screen.

[Features of the present embodiment]

Thus, in this embodiment, a layer (anode layer) which is electrically connected to the common power supply line 34 which is the cathode electrode of the organic EL element 21 and which is the same as the anode electrode of the organic EL element 21, The auxiliary electrode 35 having a fixed potential (cathode potential) wired in a row-like manner (for each pixel row) is positively utilized for the pixel array of the matrix form of the pixel array unit 30 , And the auxiliary capacitance 26 is formed by electrically connecting the other electrode of the auxiliary capacitance 26 to the corresponding auxiliary electrode 35 for each pixel 20 (contact is made) .

14, the auxiliary electrodes 35 are wired in a row with respect to the respective pixels 20 of the pixel array unit 30. However, this is merely an example, and each pixel 20 of the pixel array unit 30 is not limited to this, The configuration in which the auxiliary electrodes 35 are wired in a columnar shape (one for each pixel column) or in a lattice shape (one for each pixel column and one for each pixel column) is adopted. In this case as well, the other electrode of the storage capacitor 26 can be contacted to the pixel 20 with respect to the auxiliary electrode 35, similarly to the case of the row-wise wiring.

(Pixel layout structure)

15 is a plan view schematically showing the layout structure of the pixel 20 having the storage capacitor 26. FIG.

As shown in Fig. 15, in the pixel 20, the scanning lines 31 (31-1 to 31-m) are arranged in the row direction (pixel array direction) The power supply lines 32 (32-1 to 32-m) are wired in the row direction below the middle portion, and the auxiliary electrodes 35 are wired in the row direction with the lower pixel row . Further, signal lines 33 (33-1 to 33-n) are wired in the column direction (the arrangement direction of the pixels in the pixel column) at a portion close to the left pixel column.

The driving transistor 22, the writing transistor 23 and the storage capacitor 24 are formed in the region where the scanning line 31 and the power supply line 32 of the pixel 20 are sandwiched. A storage capacitor 26 is formed in a region where the power supply line 32 and the auxiliary electrode 35 of the pixel 20 are sandwiched. The other electrode of the auxiliary capacitor 26 is contacted (electrically connected) to the contact portion 36 for each pixel with respect to the auxiliary electrode 35, and is lowered. The auxiliary electrode 35 is supplied with a fixed potential (cathode potential) from the common power supply line 34 as described above.

As described above, the auxiliary electrode 35 to which the fixed potential is given from the common power supply line 34 which becomes the cathode electrode of the organic EL element 21 is wired in a row, a column, or a lattice form with respect to the matrix arrangement of pixels The other electrode of the storage capacitor 26 is contacted to the auxiliary electrode 35 for each pixel 20 in the organic EL display device to give a fixed potential to the other electrode of the storage capacitor 26 And the auxiliary capacitance 26 is formed with respect to the fixed potential will be described below.

&Lt; Example 1 >

16 is a cross-sectional view showing the cross-sectional structure of the pixel 20A according to the first embodiment. 16 is a cross-sectional view taken along the line A-A in Fig.

16, in the pixel 20A, the gate electrode of the driving transistor 22 is formed as the first wiring 202 on the glass substrate 201, and the gate insulating film 203 is formed thereon A semiconductor layer 204 for forming a source region and a drain region of the driving transistor 22 is formed on the first semiconductor layer 204 by polysilicon and the power supply line 32 is connected to the second And is formed as a wiring 206.

Here, the layer made of the first wiring 202, the gate insulating film 203, the semiconductor layer 204, and the interlayer insulating film 205 becomes the TFT layer 207. An insulating planarization film 208 and a wind insulation film 209 are formed in order on the interlayer insulation film 205 and the second wiring 206. A concave portion 209A provided in the wind insulation film 209 is provided with an organic EL element (21) are formed.

The organic EL device 21 includes an anode electrode 211 formed of a metal or the like formed on the bottom of the concave portion 209A of the above-described wind insulating film 209 and an organic layer (electron transporting layer, And a cathode electrode 213 (common power supply line 34) formed of a transparent conductive film or the like formed in common on all the pixels on the organic layer 212 have. Here, the layer made of the second wiring 206 and the insulating planarization film 208 becomes the anode layer 210. [

In the organic EL element 21, the organic layer 212 is formed by sequentially depositing a hole transporting / hole injecting layer, a light emitting layer, an electron transporting layer, and an electron injecting layer (both not shown) on the anode electrode 211. A current flows from the driving transistor 22 to the organic layer 212 through the anode electrode 211 under the current driving by the driving transistor 22 in Fig. And is configured to emit light when the holes are recombined.

This completes the basic pixel structure of the pixel 20 made up of the organic EL element 21, the driving transistor 22, the writing transistor 23 and the storage capacitor 24.

In this basic pixel structure, in the pixel 20A according to the first embodiment, the storage capacitor 26 has the following structure. That is, one electrode 261 is formed by the semiconductor layer 204 made of polysilicon forming the source region and the drain region of the driving transistor 22, and the electrode 261 and the interlayer insulating film 205 are formed The other electrode 262 is formed in the same process as a metal material such as the second wiring 206 so as to face the auxiliary capacitance 261. The other electrode 262 is formed between the opposing regions of the parallel plate by these electrodes 261, 26 are formed.

The other electrode 262 of the auxiliary capacitance 26 is contacted with the auxiliary electrode 35 by the contact portion 36 and is held thereon. As a result, the other electrode 262 of the auxiliary capacitance 26 is electrically connected to the auxiliary electrode 35 wired in a row-wise manner, for example, in a matrix-like pixel array, for each pixel, 35, a fixed potential is given from the common power supply line 34.

As described above, one electrode 261 made of polysilicon, which is the same as the semiconductor layer 204 of the driving transistor 22, and the other electrode 262 made of a metal material such as the second wiring 206, And the other electrode 262 is electrically connected to the auxiliary electrode 35 wired in a row-wise manner, for example, in a row-wise manner with respect to the pixel array of the matrix shape, The fixed potential is given to the other electrode 262 of the storage capacitor 26 without providing the cathode wiring in the TFT layer 207 and the storage capacitor 26 is supplied to the fixed potential, It is possible to solve the problem of the layout area of the pixel 20 and the problem of the crossing caused by the wiring resistance.

In the case of Embodiment 1, the area of the opposing area of the parallel plate of one electrode 261 and the other electrode 262 and the distance between the electrodes 261 and 262 (the thickness of the interlayer insulating film 205 And the dielectric constant of the insulating material (the interlayer insulating film 205 in this example) interposed between the electrodes 261 and 262 are determined.

&Lt; Example 2 >

17 is a cross-sectional view showing the cross-sectional structure of the pixel 20B according to the second embodiment, and the same parts as those in Fig. 16 are denoted by the same reference numerals. 17 is a cross-sectional view taken along line A-A in Fig.

In the basic pixel structure described in the first embodiment, in the pixel 20B according to the second embodiment, the storage capacitor 26 has the following structure. The other electrode 262 is formed on the glass substrate 201 by the same process using a metal material such as the first wiring 202 and the driving transistor 22 One of the electrodes 261 is formed through the gate insulating film 203 by the polysilicon forming the semiconductor layer 204 of the auxiliary capacitors 261 and 262 and the auxiliary capacitors 261 and 262 are formed between the opposing regions of the parallel plates by the electrodes 262 and 261 26 are formed.

The other electrode 262 of the auxiliary capacitance 26 is connected to the second wiring 206 by the contact portion 37 and is also connected to the auxiliary electrode 35 by the contact portion 36. [ As a result, the other electrode 262 of the auxiliary capacitance 26 is electrically connected to the auxiliary electrode 35 wired in a row-wise manner, for example, in a matrix-like pixel array, for each pixel, 35, a fixed potential is given from the common power supply line 34.

The other electrode 262 made of a metal material such as the first wiring 202 and the one electrode 261 made of polysilicon such as the semiconductor layer 204 of the driving transistor 22 are used as the auxiliary capacitance And the other electrode 262 is electrically connected for each pixel with respect to the auxiliary electrode 35 wired in a row-wise manner, for example, in a matrix-like pixel arrangement, The fixed potential is given to the other electrode 262 of the storage capacitor 26 without providing the cathode wiring in the TFT layer 207 and the storage capacitor 26 is connected to the fixed potential It is possible to solve the problems of the layout area of the pixel 20 and the problems such as cross-talk caused by wiring resistance.

In the case of Embodiment 2, the area of the opposing area of the parallel plate of one electrode 261 and the other electrode 262 and the distance between the electrodes 261 and 262 (the thickness of the gate insulating film 203 And the dielectric constant of the insulating material (the gate insulating film 203 in this example) interposed between the electrodes 261 and 262 is determined.

Assuming that the relative dielectric constant of the gate insulating film 203 and the interlayer insulating film 205 are equal and the opposite areas of the parallel flat plates are equal to each other when the first and second embodiments are compared, Since the film thickness of the gate insulating film 203 is thinner than the film thickness of the auxiliary capacitors 261 and 205, the capacitance of the auxiliary capacitors 26 is smaller than that of the first embodiment by the amount that the interval between the parallel plates can be made narrower It can be said that it can be set large.

Conversely, in the case of Embodiment 1, since the film thickness of the interlayer insulating film 205 is thicker than the film thickness of the gate insulating film 203, the occurrence rate of leakage due to interlayer short is lower than that of Embodiment 2 There is an advantage.

&Lt; Example 3 >

18 is a cross-sectional view showing a cross-sectional structure of the pixel 20C according to the third embodiment. In the drawing, the same parts as in Figs. 16 and 17 are denoted by the same reference numerals. 18 is a cross-sectional view taken along the line A-A of Fig.

The pixel 20C according to the third embodiment has the basic pixel structure described in the first embodiment. The storage capacitor 26 of the pixel 20C has the following structure. That is, first, the other first electrode 262A is formed on the glass substrate 201 in the same process as a metal material such as the first wiring 202, and a gate insulating film One electrode 261 is formed by polysilicon forming the semiconductor layer 204 of the driving transistor 22 through the interlayer insulating film 203 and the other electrode 261 is formed so as to face the corresponding electrode 261 through the interlayer insulating film 205 The second electrode 262B is formed by the same process using a metal material such as the second wiring 206 and the auxiliary capacitor 26 is formed between the opposing regions of the parallel plates formed by the electrodes 262A, 261, And are electrically connected in parallel.

The other first electrode 262A of the auxiliary capacitance 26 is connected to the second electrode 262B by the contact portion 37 and is electrically connected to the auxiliary electrode 35 by the contact portion 36. [ Respectively. As a result, the first and second electrodes 262A and 262B on the other side of the auxiliary capacitance 26 are electrically connected to the auxiliary electrode 35 wired in a row-wise manner, for example, A fixed potential is given from the common power supply line 34 through the auxiliary electrode 35 and a capacitance formed between the electrode 262A and the electrode 261 and a capacitance formed between the electrode 262B and the electrode 261, And the auxiliary capacitance 26 is formed as the composite capacitance.

As described above, the auxiliary capacitance 26 is connected to the other electrodes 262A and 262B made of a metal material such as the first and second wirings 202 and 206 and the semiconductor layer 204 of the driving transistor 22 The other electrodes 262A and 262B are formed of polysilicon and the other electrodes 262A and 262B are electrically connected to the auxiliary electrode 35 wired in a row form, for example, The connection box allows the fixed potential to be given to the other electrode 262A or 262B of the storage capacitor 26 without providing the cathode wiring in the TFT layer 207 in forming the storage capacitor 26, The auxiliary capacitance 26 can be formed with respect to the fixed potential, so that it is possible to solve the problems of the layout area of the pixel 20 and the problem of cross-talk caused by wiring resistance.

In particular, since a capacitance is formed between the first electrode 262A and the other electrode 261 and between the one electrode 261 and the second electrode 262B, Assuming that the capacitance values of Examples 1 and 2 are equal, it is possible to form the storage capacitor 26 having a capacitance value almost twice as large as those of Embodiments 1 and 2. In other words, when the capacitance value of the auxiliary capacitance 26 is as good as in the case of Embodiments 1 and 2, since the size of the electrodes 261, 262A, and 262B forming the auxiliary capacitance 26 can be reduced, The storage capacitor 26 can be formed in the pixel 20 without increasing the size of the pixel 20C as compared with the case of Examples 1 and 2. [

In the case of Embodiment 3, the area of the opposing area of the parallel plate of one electrode 261 and the other first electrode 262A, the distance between the two electrodes 261 and 262A, A capacitance value determined by the relative dielectric constant of the insulator (the gate insulating film 203 in this example) interposed between the electrodes 261 and 262A and the capacitance value determined by the capacitance value determined by the capacitance value of the opposing region of the parallel plate of the one electrode 261 and the second electrode 262B And the capacitance value determined by the distance between the electrodes 261 and 262B and the dielectric constant of the insulator (interlayer insulating film 205 in this example) interposed between the electrodes 261 and 262B The capacitance value of the auxiliary capacitance 26 is determined.

(Function and effect of the present embodiment)

As described above, in order to sufficiently secure the recording gain of the video signal, in the organic EL display device having the storage capacitors 26 in each of the pixels 20, the pixel array of the matrix shape may be arranged in a row, a column, The other electrode 262 (262A, 26AB) of the storage capacitor 26 is connected to the pixel 20 for the auxiliary electrode 35 wired and given a fixed potential, A fixed potential can be given to the other electrode 262. [ Thereby, since the auxiliary capacitor 26 can be formed with respect to the fixed potential while suppressing the wiring resistance, it is possible to suppress the cross-talk caused by the wiring resistance, thereby improving the picture quality of the display image.

In the above-described embodiment, the case where the present invention is applied to the organic EL display device using the organic EL element as the electro-optical element of the pixel circuit 20 is described as an example. However, the present invention is not limited to this application example, Optical device (light-emitting device) in which the light emission luminance changes in response to a change in the brightness of the display device.

[Application example]

The above-described display apparatus according to the present invention can be applied to various electronic apparatuses shown in Figs. 19 to 23, for example, a portable terminal apparatus such as a digital camera, a notebook type personal computer, It is possible to apply the present invention to a display device of an electronic device in all fields in which a video signal inputted to an electronic device or a video signal generated in an electronic device is displayed as an image or an image.

As described above, the display device according to the present invention is able to display a matrix of pixels arranged in rows and columns on a pixel array in a matrix form by using the display device according to the present invention as a display device of electronic devices in all fields, By connecting the other electrode of the auxiliary capacitor 26 to the auxiliary electrode 35 wired in a shape, a column shape or a lattice shape for each pixel 20, it is possible to prevent the crossing caused by the wiring resistance There is an advantage that high-quality image display can be performed in various electronic apparatuses.

Further, the display device according to the present invention also includes a module configuration of a sealed configuration. For example, this corresponds to a display module formed by attaching to a pixel array unit 30 such as a transparent glass. A color filter, a protective film, or the like, or the above-described light-shielding film may be provided on the transparent facing portion. The display module may be provided with a circuit unit or an FPC (flexible printed circuit) for inputting and outputting signals from the outside to the pixel array unit.

Specific examples of electronic appliances to which the present invention is applied will be described below.

19 is a perspective view showing the appearance of a television set to which the present invention is applied. The television set of the television set according to this application example includes a video display screen section 101 constituted by the front panel 102 and the filter glass 103 and the like. Is created by using a display device.

20 is a perspective view showing the external appearance of a digital camera to which the present invention is applied, A is a perspective view as seen from the front, and B is a perspective view as seen from the rear. The digital camera according to this application example includes a light emitting portion 111 for flash, a display portion 112, a menu switch 113, a shutter button 114 and the like, and as the display portion 112, Device. &Lt; / RTI &gt;

Fig. 21 is a perspective view showing the external appearance of a notebook personal computer to which the present invention is applied. The notebook type personal computer according to this application example includes a keyboard 122 that is operated when a character or the like is input to the main body 121, a display unit 123 that displays an image, and the like. And is manufactured by using the display device according to the invention.

22 is a perspective view showing the appearance of a video camera to which the present invention is applied. The video camera according to this application example includes a main body 131, a lens 132 for photographing a subject on the side facing forward, a start / stop switch 133 for photographing, a display 134, And a display device according to the present invention is used as the display device 134.

Fig. 23 is a front view of a portable terminal device, for example, a cellular phone to which the present invention is applied, A is a front view in a soft state, B is a side view thereof, C is a front view in a closed state, E is a right side view, F is an upper side view, and G is a lower side view. The mobile phone according to this application example includes an upper body 141, a lower body 142, a connection portion (here, a hinge portion) 143, a display 144, a sub display 145, a picture light 146, 147, and the like, and is manufactured by using the display device according to the present invention as the display 144 or the sub-display 145.

Those skilled in the art will appreciate that various modifications, combinations, subcombinations, and alterations may be made within the scope of the appended claims or equivalents thereof, depending on design and other factors.

10: organic EL display device 20, 20A, 20B, 20C: pixel (pixel circuit)
21: organic EL element 22: driving transistor
23: recording transistor 24: storage capacity
25: EL capacity 26: auxiliary capacity
30: pixel array units 31 (31-1 to 31-m): scanning lines
32 (32-1 to 32-m): power supply lines 33 (33-1 to 33-n): signal lines
34: common power supply line 35: auxiliary electrode
40: recording scanning circuit 50: power supply scanning circuit
60: horizontal drive circuit 70: display panel

Claims (6)

  1. An electro-optical element disposed between the anode electrode and the cathode electrode, a pixel array section in which pixels including a driving transistor and a capacitor, a recording transistor for recording a video signal, and a driving transistor are arranged in a matrix form;
    A power supply line wired for each pixel row of the pixel array unit;
    And an auxiliary electrode electrically connected to the cathode electrode and wired in a row, a column, or a lattice pattern with respect to a pixel array in a matrix form of the pixel array portion in the same layer as the anode electrode,
    Wherein one of the electrodes is formed by a semiconductor layer which forms a source region and a drain region of the driving transistor and the other electrode is formed in the same wiring layer as the power source supply line and the other electrode is provided between the wiring layer and the semiconductor layer And the auxiliary electrode is connected to the other electrode via a contact portion provided for each pixel.
  2. The method according to claim 1,
    Wherein the power supply line is wired close to a scanning line belonging to an adjacent pixel row and selectively applies a first potential and a second potential lower than the first potential to the drain electrode of the driving transistor.
  3. An electro-optical element disposed between the anode electrode and the cathode electrode, a pixel array section in which pixels including a driving transistor and a capacitor, a recording transistor for recording a video signal, and a driving transistor are arranged in a matrix form;
    A power supply line wired for each pixel row of the pixel array unit;
    And an auxiliary electrode electrically connected to the cathode electrode and wired in a row, a column, or a lattice pattern with respect to a pixel array in a matrix form of the pixel array portion in the same layer as the anode electrode,
    Wherein one of the electrodes is formed by a semiconductor layer which forms a source region and a drain region of the driving transistor and the other electrode is formed in the same wiring layer as the gate electrode of the driving transistor, And the auxiliary electrode is connected to the other electrode through a contact portion provided for each pixel.
  4. 3. The method of claim 2,
    Wherein the other electrode includes a first electrode and a second electrode electrically connected to each other,
    Wherein the first electrode is formed in the same wiring layer as the gate electrode of the driving transistor and faces the one electrode through a gate insulating film interposed between the wiring layer and the semiconductor layer,
    Wherein the second electrode is formed in a wiring layer like the power supply line and faces the one electrode through an interlayer insulating film interposed between the wiring layer and the semiconductor layer.
  5. 5. The method of claim 4,
    Wherein one of the electrodes is formed by a semiconductor layer which forms a source region and a drain region of the driving transistor and the other electrode is formed by a metal material so as to face the semiconductor layer,
    Wherein the auxiliary electrode and the other electrode of the capacitance are electrically connected through the contact portion formed in the planarization film formed above the semiconductor layer.
  6. An electro-optical element disposed between the anode electrode and the cathode electrode, a recording transistor for recording a video signal, a capacitor, and a pixel array portion in which pixels including the driving transistor are arranged in a matrix form;
    A power supply line wired for each pixel row of the pixel array unit;
    And an auxiliary electrode electrically connected to the cathode electrode and wired in a row, a column, or a lattice pattern with respect to a pixel array in a matrix form of the pixel array portion in the same layer as the anode electrode,
    Wherein one of the electrodes is formed by a semiconductor layer which forms a source region and a drain region of the driving transistor and the other electrode is formed in the same wiring layer as the power source supply line and the other electrode is provided between the wiring layer and the semiconductor layer And the auxiliary electrode is connected to the other electrode through a contact portion provided for each pixel.
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US20140049456A1 (en) 2014-02-20
US20090046040A1 (en) 2009-02-19
KR20140110815A (en) 2014-09-17
JP2009047764A (en) 2009-03-05
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US20160035278A1 (en) 2016-02-04
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